EMPLOYEE BENEFIT PLANS - Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Pension Benefits
Employee benefit plans
Service cost	$ 21,049	$ 23,421	$ 22,159
Interest cost	38,769	36,244	34,190
Expected return on plan assets	(51,171)	(52,941)	(53,684)
Net amortization and deferral	1,732	2,394	(3,043)
Net periodic (income) cost	10,379	9,118	(378)
Other Benefits
Employee benefit plans
Service cost	5,615	6,048	4,489
Interest cost	6,959	6,900	5,219
Expected return on plan assets	(12,788)	(11,949)	(10,543)
Net amortization and deferral	(2,064)	(375)	(2,019)
Net periodic (income) cost	$ (2,278)	$ 624	$ (2,854)